The mechanical and the electrical components of the German-made Minifon are discussed in detail. The use of subminiature electronic components and watchmakers` techniques have resulted in a commercial 2 lb. 7 oz. battery-operated pocket magnetic wire recorder measuring but 13/8 x 43/8 x 65/8 in. Included are all essential components for record, playback, rewind, and erase.
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https://aes2.org/publications/elibrary-page/?id=136
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